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3660 Digital Modem Connection Troubles

Hi,

We have a 3660 with a digital modem module hooked up to a 30 line (e1) isdn pipe. The router handles both incoming isdn and analogue connections for our remote workers. We've found however that almost always the first time you attempt to dialin from a remote location no connection will be established (no modem trainup is heard nor engaged tone or similar). This happens with a variety of modems - both internal and external and of differing makes.

Cancelling then re-dialing results in a successful connection. We've upgraded the mica firmware to the latest version but still no luck. I believe the output below is of one such failed call. It shows the disconnect cause as a software reset.

Does anyone have any suggestions for places to look in curing this problem or has anyone encountered similar problems before?

Modem 2/4 Mica: Event Log contains 18 Events:

00:06:16.608 CSM: Incoming call from 01278446645 to Unknown

00:06:16.608 CSM: event-ISDN_CALL New State-IC_MODEM_RESERVED

CSM: status-1 dchan-3/0 bchan-2

00:06:16.580 MICA-Cfg issued S-Reg configuration change:

S45 = 0 Null transmit and receive Signalling Type

00:06:16.580 MICA-Cfg issued S-Reg configuration change:

S46 = 0 No call progress tone detection

00:06:16.580 MICA-Cfg issued S-Reg configuration change:

S11 = 0 In Answer Mode

00:06:16.580 CSM: event-ISDN_CONNECTED New State-WAIT_FOR_CARRIER

00:06:16.456 MICA-Cmd Ack Enter-Call-Setup.

00:06:16.444 MICA-Ntf in modem state CALL_SETUP.

00:06:16.444 MICA-Cmd Ack Initiate-Link.

00:06:15.384 MICA-Ntf in modem state CONNECT.

00:06:10.896 MICA-Ntf in modem state LINK.

00:06:29.420 CSM: event-ISDN_DISCONNECTED New State-DISCONNECTED_STATE

00:06:29.408 MICA-Ntf in modem state TERMINATING.

00:06:29.408 MICA-Cmd Ack SOFTWARE_RESET.

00:06:29.388 MICA-Ntf in modem state IDLE.

00:06:29.388 CSM: event-MODEM_DISCONNECTED New State-DISCONNECTED_STATE

00:06:29.388 CSM: event-QUEUED_DISCONNECT New State-IDLE_STATE

00:06:29.376 MICA-Qry Final Link Information:

Call Time - 00:00:08, Disconnect Reason (0x6001) - SOFTWARE_RESET command

0 retrains and/or speed shifts, 0 ec retransmissions

0 chars tx, 0 chars rx, 25 chars rx bad

0 ppp packets tx, 0 ppp packets rx, 0 ppp packets rx bad

0 ec packets tx, 0 ec packets rx, 0 ec packets rx bad

1 REPLY
Bronze

Re: 3660 Digital Modem Connection Troubles

Can you send "sh diag"? I'm suspecting CSCdp58461. You can also check "show modem operational-status" and "show modem csm s/p" and "sh modem" (you may see BAD modems"). If all this matches, please open a case with the TAC and mention CSCdp58461.

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